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Published on: August 16, 2018
GABAergic control of the subthalamic nucleus
Mark D Bevan1, Nicholas E Hallworth, Jérôme Baufreton
1Northwestern University, Department of Physiology, Feinberg School of Medicine, 303 E. Chicago Avenue, Chicago, IL 60611, USA. m-bevan@northwestern.edu
Progress in Brain Research
|May 15, 2007
Summary
The subthalamic nucleus (STN) regulates movement and is dysfunctional in Parkinson's disease. GABAergic feedback from the external globus pallidus (GP(e)) can paradoxically enhance STN responses, potentially impacting Parkinson's disease.
Area of Science:
- Neuroscience
- Neurophysiology
- Cellular Neuroscience
Background:
- The subthalamic nucleus (STN) is a crucial component of the basal ganglia, essential for voluntary movement.
- STN dysfunction is implicated in Parkinson's disease (PD).
- STN activity is modulated by the external globus pallidus (GP(e)) and cortical inputs.
Purpose of the Study:
- To investigate the mechanisms regulating STN neuronal activity.
- To explore the role of GABAergic feedback and dopamine in STN function.
- To understand how these mechanisms contribute to PD pathophysiology.
Main Methods:
- Electrophysiological recordings of STN neurons.
- Analysis of intrinsic membrane properties and synaptic integration.
- Investigation of GABAergic and dopaminergic receptor actions.
Main Results:
- GABAergic feedback from GP(e) can paradoxically enhance STN responses to excitatory inputs.
- GABAergic inhibition can reset autonomous STN firing and promote rebound burst firing.
- Dopamine influences STN integrative properties and synaptic plasticity, critical for in vivo activity patterning.
Conclusions:
- GP(e) feedback inhibition plays a complex role in modulating STN output.
- Dopamine's actions on STN neurons are vital for activity regulation.
- These findings offer insights into the rhythmic burst firing observed in the dopamine-depleted STN in Parkinson's disease.
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